How do outputs work?
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Suppose someone gives me 1 XMR, that I'll call 'A'. That person can now see when that output A they give me is used in a ring signature for a transaction. If I then make a transaction where I send 0.1 XMR, I send that 1 XMR output A and then receive 0.9 in change right? Now how does the tracking of A work now? If I go and make another transaction using the 0.9 in my wallet, will that initial output A once again be used in that transaction?